/**
 * @file   hello.cpp
 * @author Chen Guanyu<1415312185@qq.com>
 * @date   Fri Sep 17 8:48:48 2021
 * @brief  This is my homework for the first lesson.
 *
 *
 */
#include<iostream>
/**
 * main function
 *
 * @param argc number of shell parameters.
 * @param argv strings for all parameters.
 *
 * @return system signals.
 */
int main(int argc,char* argv[]){
  std::cout <<"Hello World!\n"<<std:: endl;
  return 0;
}
